Crisp Tetraploid Contrast for the Canadian Shade Garden
Hans Hansen of Walters Gardens registered Hosta 'American Sweetheart' in 2002 as a tetraploid sport of the classic 'Sea Thunder'. The tetraploid status gives it significantly thicker leaf substance and greater garden vigour than its parent. Upright, heart-shaped leaves emerge with a creamy-yellow centre that brightens to a clean white as the season progresses, framed by an extra-wide, dark green margin throughout. At 61 cm (24") tall and 104 cm (41") wide, it forms a bold, vase-shaped mound that anchors shaded borders with striking presence. Hardy from Zone 3 through 9, it is a reliable and luminous performer across Canada.
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Crisp white centre with seasonal shift: Leaves emerge creamy-yellow and brighten to a clean, stable white by midsummer, creating a sharp halo effect against the saturated dark green margins.
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Tetraploid leaf substance: Thicker, leathier foliage than standard diploid hostas, offering elite natural resistance to slug damage and outstanding garden durability.
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Upright vase-shaped habit: The architectural mound adds vertical interest and allows smaller companion plants to be tucked naturally around its base.
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Luminous shade presence: The wide white centres act as a natural reflector, brightening the darkest corners of a woodland border or shaded garden bed.
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Lavender summer flowers: Elegant blooms rise on sturdy upright scapes in mid-to-late summer, adding a soft finishing touch and attracting local pollinators.
| Feature |
Specification |
| Size (H × W) |
61 cm × 104 cm (24" × 41") |
| Hardiness Zone |
3–9 |
| Colour |
Creamy-yellow to white centre, wide dark green margin |
| Light Requirements |
Partial to full shade |
Grower's Tip: 'American Sweetheart' handles Canadian winters with ease from Zone 3 through 9, and its tetraploid toughness makes it one of the most reliable white-centred hostas for gardens from Winnipeg, MB to St. John's, NL. We grow every division at our nursery in Bécancour, QC, monitoring the creamy-to-white centre transition and wide green margins before any plant leaves us. Our True to Type standard means you receive the authentic Hosta 'American Sweetheart' — Hans Hansen’s original tetraploid selection, verified and ready for your garden.
